This page attempts to list all Sony ATRAC chipsets (CXDxxxx) found in decks and units they can be found in. It uses this a-nkmr page as it's main source. Hopefully it expands to cover all chipsets. Potentially useful thread on sonyinsider.

More technical info: https://www.minidisc.org/atrac_versions.html

http://www.puwa-net.com/minidisc/technical/atracchange.htm
https://web.archive.org/web/20010828211157/http://psych.tripod.com/md-tech.html - chart of some chip part#'s

ATRAC version
* 1
* 2
* 3
* 3.5
* 4
* 4.5
* Type-R
* Type-S

Ver. 1.0: CXD2527

 

 MDS-101 (1993): CXD2527R-1

 Since significant bitrate capacity was devoted to error control, the sound quality was poor.

Ver. 2.0: CXD2531

 MDS-102 (1994): CXD2531BR

 MDS-501 (1994): CXD2531BR (from service manual)

CXD2531BR Datasheet

Ver. 3.0: CXD2535 / CXD2536

Ver. 3.5: CXD2536

Ver.4.0: CXD2650 / CXD2652

Ver. 4.5: CXD2537 / CXD2654

Type-R: CXD2656 / CXD2656R / CXD2662R

CXD2656 (NON-MDLP)

CXD2656R (MDLP)

CXD2662R (MDLP):

Type-S: CXD2664R

Sharp 5th gen ATRAC release https://web.archive.org/web/20020606052518/http://www.sharp.co.jp/sc/gaiyou/news/970730-2.htm

Sharp 6th gen process size etc https://web.archive.org/web/20020404232232/http://www.sharp.co.jp/sc/gaiyou/news/980805.htm

Sharp 7th gen process https://web.archive.org/web/20020605235543/http://www.sharp.co.jp/sc/gaiyou/news/990803-1.html